Semi-open shelf mode Semi-open shelf is a way to provide books and periodicals between closed shelf and open shelf. Semi-open bookcase is to display books in a bookcase with glass, with the back facing outwards and a small gap left in the middle of the glass. Readers can see the title and the appearance of the book, but they can't extricate themselves. When borrowing books, readers can indicate which book to borrow from the glass gap, and the librarian will take it out to handle the borrowing procedures for readers. Compared with closed-shelf lending, semi-open-shelf lending broadens the openness of readers, allows them to browse the books on shelves, and reduces the links of consulting the catalogue and filling out the call list; Compared with open shelves, readers are restricted by another layer. They can't borrow books by themselves, but must borrow books through the library staff. The number of books available for display on semi-open shelves is only a part of circulating books, which are basically books intensively used by readers, such as new books, literature books and foreign language learning books. , and can only occupy limited space, in some places of the lending room, reading room, auxiliary stacks, and most circulating books can't be displayed like this. Therefore, semi-open shelf is an auxiliary borrowing method between open shelf and closed shelf. This kind of borrowing method has its unique function, which is convenient for promoting, recommending, organizing and managing some books, and to some extent, it is convenient for readers to choose books intuitively. It is an auxiliary way to make up for the shortage of closed-shelf borrowing.